If at age 9 my son scores as well as the average MIT freshman on the SAT I and the SAT II subject tests, then I will have him use MIT Open Courseware and other resources to study what those students are studying, at least if my son wants to do so.
I don't want to read too much into a couple lines, but this sounds like falling into the calculus trap. Normal math curricula and tests like the SAT/ACT are very shallow. Going deeper may be better than going faster.
http://www.artofproblemsolving.com/Resources/articles.php?page=calculustrap
